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# What is a perfect number?

Question #66439. Asked by myjoey. (Jun 01 06 7:59 AM)

mctavish99

In mathematics, a perfect number is defined as an integer which is the sum of its proper positive divisors, that is, the sum of the positive divisors not including the number. Equivalently, a perfect number is a number that is half the sum of all of its positive divisors, or รณ(n) = 2 n.

Six (6) is the first perfect number, because 1, 2 and 3 are its proper positive divisors and 1 + 2 + 3 = 6. The next perfect number is 28 = 1 + 2 + 4 + 7 + 14. The next perfect numbers are 496 and 8128

http://en.wikipedia.org/wiki/Perfect_number

 Jun 01 06, 8:16 AM
zbeckabee

Nice list of Perfect Numbers:

http://ellerbruch.nmu.edu/classes/cs255f01/cs255students/tkapela/P11/All.doc

 Jun 01 06, 9:20 AM
robboy

A pair of Dammitheads, I'm told.

 Jun 01 06, 9:48 AM

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